A TECO Model 49 ultraviolet photometer was used for the ozone measurements.

The model features show good agreement with initial ozone measurements following the eruption, including both the mid-altitude switch from ozone loss to ozone gain, and the increase and subsequent decrease in the total ozone column.

Aircraft based in-situ Tropospheric ozone measurements provide data relevant to: pollution events, lower atmosphere mixing dynamics, boundary layer stability, ozone trend studies, and the validity of other samples collected in-flight.

Furthermore, the latest ozone measurements reflect only gases released in the 1970's and earlier; gases now rising through the lower atmosphere will take seven to 10 years to reach the stratosphere, six to 15 miles above Earth's surface.

Later these measurements were important for Dobson when he commenced his ozone measurements in Antarctica in 1956.

In addition to total ozone measurements from the SBUV/2 instrument, Antarctic ozone hole size estimates are also calculated with SBUV/2 data from September through December.

That assumption is now being undermined by the surprising ozone measurements and by a new understanding of the interaction of air and oceans.

Rural ozone measurements yield information on background ozone levels, which, since 1900, have risen globally.

In particular, their ozone measurements gained international recognition.

To better monitor the high rate of depletion, NOAA researchers in Greenland are doubling the frequency of ozone measurements using research balloons in the coming weeks.